Effect of carbon fiber content of the SLS mold on grain size of ZL205 Aalloy produced by vacuum counter-pressure casting were investigated through testing and analyzing the grain size subjected to different carbon fiber content.The results indicate that the grain size in aluminum alloy is refined greatly with the increase of carbon fiber content

however

the carbon fiber content is more than 3%

the grain size is increased with the increase of carbon fiber content.At the same carbon fiber content

the grain size is increased with the increase of the sample thickness.Meanwhile

the relationship of the grain size of vacuum counter-pressure casting ZL205 Aaluminum alloy with carbon fiber content and sample thickness was established.When the sample thickness is more than 9 mm

effects of sample thickness on grain size is obvious

however

the sample thickness is less than 9mm

effect of carbon fiber content on grain size is the major.